Strontium
chemical element
strontium (Sr), chemical element, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table. It is used as an ingredient in red signal flares and phosphors and is the principal health hazard in radioactive fallout.
| atomic number | 38 |
|---|---|
| atomic weight | 87.62 |
| melting point | 769 °C (1,416 °F) |
| boiling point | 1,384 °C (2,523 °F) |
| specific gravity | 2.63 |
| oxidation state | +2 |
| electron configuration | [Kr]5s2 |
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